Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Financial Liabilities:
Proved Oil and Gas Property and Other Assets Carrying Amount	$ 247
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period	154
Pretax Impairment Charge for Proved Oil and Gas Properties and Other Assets, in which EOG utilized an accepted offer from a third-party buyer	7
Pretax Impairment Charge for Proved Oil and Gas Properties and Other Assets	93
Aggregate Principal Amount of Current and Long-Term Debt	6,290	6,290
Fair Value of Debt	6,692	7,032
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Financial Assets: Crude Oil Swaps		0
Financial Assets: Crude Oil Options/Swaptions		0
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps	0
Financial Liabilities: Crude Oil Options/Swaptions	0	0
Financial Liabilities: Natural Gas Options/Swaptions		0
Financial Liabilities: Foreign Currency Rate Swap	0	0
Financial Liabilities: Interest Rate Swap	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Financial Assets: Crude Oil Swaps		65
Financial Assets: Crude Oil Options/Swaptions		36
Financial Assets: Natural Gas Options/Swaptions	48	65
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps	16
Financial Liabilities: Crude Oil Options/Swaptions	159	8
Financial Liabilities: Natural Gas Options/Swaptions		13
Financial Liabilities: Foreign Currency Rate Swap	46	55
Financial Liabilities: Interest Rate Swap	2	4
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Financial Assets: Crude Oil Swaps		0
Financial Assets: Crude Oil Options/Swaptions		0
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps	0
Financial Liabilities: Crude Oil Options/Swaptions	0	0
Financial Liabilities: Natural Gas Options/Swaptions		0
Financial Liabilities: Foreign Currency Rate Swap	0	0
Financial Liabilities: Interest Rate Swap	$ 0	$ 0

No authoritative reference available.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced.

+ References

No definition available.

+ Details

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Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
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- Definition

Financial commodity price swap contract which provides the counterparty option to enter into a price swap contract at a later date.

+ References

No definition available.

+ Details

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced.

+ References

No definition available.

+ Details

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- Definition

Net dollar amount capitalized on balance sheet representing an enterprise's interests in proved crude oil (including condensate and natural gas liquids) and/or natural gas properties.

+ References

No definition available.

+ Details

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- Definition

Fair value of proved oil and gas property and other property, plant and equipment as of the balance sheet date.

+ References

No definition available.

+ Details

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

+ Details

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

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- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

+ Details

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